I just added the following to the 19th century timeline (1st half) and to the post Serpent & Ophicleide: History and Images.

1833-1900—Turnhout, Belgium: A catchpenny print entitled Harmonie, probably published by Glenisson and Van Genechten, features musicians playing various instruments, including a buccin (trombone with dragon-head bell) and a standard trombone (see below detail; public domain) (Catchpenny Prints of the Dutch Royal Library).